package com.itheima.reggie.filter;
import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;


/**
 * @author lifeihu
 * @date 2021/11/22
 * @TIME:10:24
 */
@Slf4j
@WebFilter(filterName = "LoginCheckFilter",urlPatterns="/*")
public class LoginCheckFilter implements Filter {
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest req= (HttpServletRequest) servletRequest;
        HttpServletResponse resp= (HttpServletResponse) servletResponse;
        String requestURI = req.getRequestURI();
        /*if(uri.equals("/employee/login")){
            filterChain.doFilter(req,resp);
            return;
        }
        HttpSession session = req.getSession();
        Long employee = (Long) session.getAttribute("employee");
        if(employee==null){
            resp.sendRedirect("/backend/page/login/login.html");
            return;
        }
        filterChain.doFilter(req,resp);*/
        log.info("拦截到请求：{}",requestURI);

        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/upload",
                "/user/**",
                "/doc.html",
                "/swagger-ui.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs",
                "/order/notifyAll"
        };

        //2、判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        //3、如果不需要处理，则直接放行
        if(check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(req,resp);
            return;
        }
        //4、判断登录状态，如果已登录，则直接放行
        if(req.getSession().getAttribute("employee") != null){
            log.info("用户已登录，用户id为：{}",req.getSession().getAttribute("employee"));
            Long empId = (Long) req.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(req,resp);
            return;
        }
        if(req.getSession().getAttribute("user")!=null){
           Long userId = (Long) req.getSession().getAttribute("user");
           BaseContext.setCurrentId(userId);
            filterChain.doFilter(req,resp);
            return;
        }

        log.info("用户未登录");
        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        resp.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }

    }

